R&D Report 1976-16 : Experimental digital transmission of multiplexed video and audio signals at 120 Mbit/s.
During 1975, field trials were carried out in which 120 Mbit/s signals, generated by equipment specially constructed in BBC Research Department, were transmitted over a UK Post Office experimental high-speed digital line system. Multiplexed video and audio signals were sent from Portsmouth to Guildford and back, from Portsmouth to Southampton and back, and also through these circuits in tandem. An outline of the experimental equipment is given. No serious difficulties arose in the trials but several interesting facts which emerged are discussed, mainly concerning error performance and timing jitter.